Possible Clues:

• Sudden fall of snow disrupted a mostly calm haven
• Sudden appearance of an overwhelming mass
• Suffer naval disruption getting stuck inside deluge
• A farewell to embrace fellow heading off with companion in sudden rush
• Sudden inundation
• Snow or rock fall
• Great snowfall
• Stuck in a valley, unable to move? Not half, after this?
• Heavy fall of rock or snow from mountain
• Slide of a large amount of snow down a mountain